If the Ruby/gemset you specified doesn't exist on a slave that the build is running, it'll be automatically installed and created (via rvm_install_on_use_flag)

Configuration

Once this plugin is installed, you'll see the "Run the build in a RVM-managed environment" option under the "Build Environment" section. Click the checkbox, then type in the Ruby implementation name in the text box. The implementation name is of the form RUBY[@GEMEST]. See the RVM documentation and the output of rvm list known for possible values.